JPH1189024A - Switchgear - Google Patents

Abstract

(57) [Summary] [Problem] A vacuum circuit breaker of a type in which a movable electrode contacts and separates a fixed electrode extending left and right about a main shaft as a fulcrum, the width dimension is widened by the fixed electrode extending left and right, and the vacuum circuit breaker is enlarged. I do. In the present invention, a fixed electrode and a grounding device are arranged so as to be inclined toward a fulcrum. [Effect] The switchgear can be reduced in size by the amount corresponding to the inclination of the circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum switchgear, and more particularly to a novel switchgear arrangement structure in which at least one of a circuit breaker, a disconnector, a load switch, and a grounding device is assembled.

[0002]

2. Description of the Related Art In response to an increasing demand in an area where power consumption is concentrated in an urban area, it is difficult to locate a substation for distribution with 6 KV supply.
Due to the lack of room for distribution pipes and an increase in the operation rate of the 6KV supply facility, it is possible to increase the distribution voltage, that is, to actively absorb the load to a 22KV system having a larger capacity per line than 6KV, which results in efficient power supply. It leads to equipment formation.
For this reason, it is necessary to reduce the size of the 22KV distribution equipment to about 6KV. As the receiving and transforming equipment for downsizing, for example, the S described in JP-A-3-273804 is disclosed.
F ₆ gas insulated switchgear can be considered. In this switchgear, a circuit breaker, two disconnectors, and a grounding switch are separately manufactured and housed in a unit room and a bus room in which a distribution box is filled with insulating gas. When a vacuum circuit breaker is used as a circuit breaker, the movable electrode moves up and down with respect to the fixed electrode by the operation device of the vacuum circuit breaker, and is turned on and off. Further, in the vacuum circuit breaker described in Japanese Patent Application Laid-Open No. 55-143727, the movable electrode is rotated left and right about the main shaft to come in contact with and separate from the fixed electrode, and is turned on and off.

A gas insulated switchgear receives, for example, electric power from an electric power company by a disconnector and a gas circuit breaker, changes the voltage to a voltage optimal for a load by a transformer, and supplies electric power to a load, such as a motor. To maintain and inspect the substation equipment,
After the gas circuit breaker is turned off, the disconnecting switch provided separately from the gas circuit breaker is opened, and the grounding switch is grounded, so that the residual charge and the induced current on the power supply side flow to the ground, and the power supply from the power supply is restored. The application of voltage is prevented to protect the worker's safety. Also,
If the grounding switch is grounded while the bus is charged, an accident may occur. Therefore, an interlock is provided between the disconnecting switch and the grounding switch.

[0004]

Problems to be Solved by the Invention For example, Japanese Patent Application Laid-Open No. 3-27380
The SF ₆ gas insulated switchgear described in Japanese Patent Publication No. 4 is separately manufactured and accommodated with a gas circuit breaker, two disconnectors and a grounding switch in a unit room and a bus room filled with SF ₆ gas in a distribution box. doing. When a vacuum circuit breaker is used as a circuit breaker, the movable electrode is moved up and down with respect to the fixed electrode by the operation device of the vacuum circuit breaker.
In the vacuum circuit breaker described in Japanese Patent Application Laid-Open No. 55-143727, a movable lead wire and a movable electrode corresponding to a movable blade are pivoted right and left around a main shaft to contact and separate from a fixed electrode.
It is shut off.

However, in the latter type, the movable blade, which is a movable lead wire, has a movable electrode which is inclined at the closing position and the closing position. On the other hand, since the surface of the fixed electrode corresponding to the movable electrode is attached to the vacuum in a vertical or parallel state, it is inevitable that the width direction becomes wide and the vacuum circuit breaker becomes large.

An object of the present invention is to provide a miniaturized switchgear in which a movable electrode rotates via a main shaft.

[0007]

According to a first aspect of the present invention, there is provided a switchgear comprising: a grounding device, a load side conductor and a fixed electrode disposed in a vacuum grounding container, and a fixed electrode and a ground via a fulcrum of a main shaft. A movable electrode which comes into contact with and separates from the device is provided, and the fixed electrode and the grounding device are arranged so as to be inclined to the fulcrum side.

[0008] The switchgear according to the second aspect of the present invention is the switchgear according to the first aspect, wherein the movable electrode has the disconnection position while the movable electrode moves from the closing position of the fixed electrode to the ground position.

According to a third aspect of the present invention, there is provided a switchgear including a fixed electrode disposed in a vacuum grounding vessel, and a movable electrode which is in contact with and separated from the fixed electrode via a fulcrum of a main shaft. It is to arrange it inclining to the side.

In the switch gear according to a fourth aspect of the present invention, in the inclination direction, the distance between the movable electrode and at least one of the two electrodes is gradually increased from one end to the other end of the movable drive section of the movable electrode. 4. The method according to claim 1, wherein
In the described switchgear. The switchgear according to claim 5 of the present invention is configured such that the movable electrode is parallel to the movable-side drive unit at the cutoff position, and the fixed electrode and the grounding device are aligned with the inclined surface of the movable electrode that is inclined at the closing position. 4. The method according to claim 1, wherein at least one side is arranged to be inclined.

The switchgear according to a sixth aspect of the present invention is the switchgear according to the first or third aspect, wherein the load-side conductor disposed in the vacuum grounding vessel and the movable electrode are connected by an electric means. The switchgear according to a seventh aspect of the present invention is the switchgear according to the first or third aspect, wherein a means for interrupting a current flow is provided in a part of the movable electrode and the movable-side drive unit.

The switchgear according to the eighth aspect of the present invention is the switchgear according to the first or third aspect, wherein a high melting point metal member is used for the electrode.

According to a ninth aspect of the present invention, there is provided a switchgear including a fixed electrode disposed in a vacuum grounding container, and a movable electrode which is in contact with and separated from the fixed electrode via a fulcrum of a main shaft. Circuit breakers, disconnectors,
It is intended to be used for a switchgear in which one or two or more of a load switch and a grounding device are assembled.

According to a tenth aspect of the present invention, the switchgear uses a grounding container having an insulating medium in place of the vacuum grounding container.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The circuit diagram of FIG. 1 shows the entirety of the collective switchgear, and FIG. 2 shows an electric circuit adapted to the structure of the circuit switchgear for one circuit of FIG.
3 and 4 show the structure of the circuit switchgear for one circuit. FIG. 5 shows a relay terminal plate 27 for connecting each phase of the circuit switchgear with a bus.

For example, switch gears 1, 2, 2, 3
3 was placed in a vacuum grounded container 4 grounded. Since the circuit switch gears 1, 2, and 3 have the same configuration, the second circuit switch gear 2 will be described, and the description of the other three circuit switch gears will be omitted. The circuit switchgear 2 is a set of three phases of phase switchgears 2X, 2Y and 2Z. Since each phase switch gear 2X, 2Y, 2Z has the same configuration, the first
Only the phase switch gear 2X of the phase will be described, and description of the other phase switch gears 2Y and 2Z will be omitted.

The phase switchgear 2X is a combination of a shutoff function, a disconnection function, a grounding function, and a bus. That is, the phase switch gear 2X mainly includes the movable electrode 7 that moves between the fixed electrode 5 and the grounding device 6.
The fixed electrode 5 is connected to the internal bus 8. The movable electrode 7 is connected to a load-side conductor 9, and the load-side conductor 9 is connected to a cable head 10 extending outside the vacuum grounding container. In addition, the movable electrode 7 is mechanically connected to a movable blade described later, and is rotated vertically or horizontally by rotation of a movable blade driven by an operation mechanism (not shown). When the movable electrode 7 moves from the fixed electrode 5 to the grounding device 6, FIG.
Stop at 4 positions.

The circuit switchgear 1 is electrically connected to a system power supply 12 by a power supply side cable 11 connected to the movable electrode 7.

That is, as the movable electrode 7 rotates,
The movable electrode 7 is energized at the input position Y1 where the movable electrode 7 contacts the fixed electrode 5, and rotates below the input position Y1 to separate the movable electrode 7 from the fixed electrode 5 at the cutoff position Y2 and cut off the current. Further, the movable electrode 7 is rotated downward to separate the fixed electrode 5 from the fixed electrode 5 at the disconnection position Y3, so that insulation is not broken by lightning or the like, and an insulation distance is provided so that the worker is not electrocuted on the load conductor side. The movable electrode 7 is further below.
Rotates, and the movable electrode 7 contacts the grounding device 6 at the grounding position Y4. It should be noted that omitting the disconnection position Y3 and moving from the interruption position Y2 to the ground contact position Y4 does not impair the following effects of the present invention. Since the movable electrode 7 can continuously perform four positions by one operation while the movable electrode 7 rotates from the fixed electrode 5 to the grounding device 6 in a vacuum of a high insulator, it is easy to operate and easy to use. In addition, since the movable electrode 7, the fixed electrode 5, and the grounding device 6 are integrated in one place, the size can be further reduced as compared with the above-described conventional technology. Further, when the disconnection position Y3 is provided, in the case of different power supply matching, for example, in two-line power receiving having two system power supplies, the phase switch gear 2X of one of the lines is operating at the closing position Y1, and the phase switch gear 2Y of the other line is in operation. During standby at the disconnection position Y3, it is not only safe for the worker to come into contact with the load-side conductor 9, but also when switching from standby to operation or from operation to standby, the work can be performed continuously. Is fast,
Easy to operate.

Further, the current flowing through the current transformer 13 is detected by the current transformer 13, and the protection relay 14 is operated to trip an operation mechanism (not shown), thereby coping with a system failure.

The grounded vacuum grounding container 4 is made of a stainless steel member, a part of which is formed in a spherical or curved shape, to increase the mechanical strength of the vacuum grounding container 4,
The thickness of the vacuum grounded container wall is reduced to reduce the weight. The vacuum grounding container 4 is housed in a switchboard 16. The switchboard 16 has an operation compartment 17 and a conductor compartment 18 on the upper and lower sides of the vacuum grounding container 4. The operation compartment 17 is disposed so as to be recessed on the right side, that is, the depth side of the vacuum grounding container 4, and has a door 19 which can be opened and closed on the front side. Also conductor compartment 1
Reference numeral 8 is arranged on the left side of the vacuum grounding container 4, that is, on the near side.

The operation compartment 17 and the conductor compartment 18 are arranged obliquely symmetrically via the vacuum grounding container 4. The operation compartment 17 houses an operation mechanism for rotating the movable blade and the movable electrode 7.
The conductor compartment 18 houses the load-side conductor 9 and the cable head 10. Operation compartment 17
A tool for maintaining and inspecting the inside of the operation compartment can be placed on the vacuum vessel in front of the above, which facilitates maintenance and inspection. Also, the conductor compartment 18 is arranged on the front side before the operation compartment 17 so that the cable head 10
The installation work can be done safely.

Nine bushings 21 are mounted on the front wall of the vacuum grounding container. One side of the first circuit switchgear 1 and the three-phase power supply side cable 11 is connected to an external system power supply 12 through a bushing 21.
The second and third circuit switch gears 2 and 3 each having a three-phase one-side grounding device 6 are connected to the cable head 10 through the bushings 21 and 21A. At the time of connection, it is inserted into the cable head 10 provided on the load-side conductor 9. A flexible conductor 22 is used for the load-side conductor 9 in the bushings 21 and 21A, and the transformer TR, other circuits,
Connected to a load such as a motor. Each phase of the cable head 10 of the second circuit switchgear 2 is provided with a current transformer 13 as shown in FIG. Current transformers 13 are provided in other circuit switchgears 1 and 3 as needed, such as load conditions.

The grounding devices 6 correspond to the nine cable heads, are disposed above the cable heads, and connect the grounding conductor 38 to the common grounding conductor 24. Both ends of the common grounding bracket 24 are fixed to the switchboard 16 by grounding screws 25. The cable head 10, the ground terminal 23, and the current transformer 13 can all be seen from the front side to prevent forgetting to attach, and to make the attaching and detaching work easier for the worker, thereby improving work efficiency. Is wearing.

In FIG. 1, the internal bus 8 directly connects the circuit switchgears between the switchgears for each of the three circuits, but this is because the circuit switchgears are directly connected for easy understanding of the embodiment. is there. Actually, the relay terminal plate 27 shown in FIG. 1 is mounted on the inner wall surface of the vacuum grounding container 27 constituted by a part of the nine fixed electrodes 5 shown in FIG. 5, and the above-mentioned internal bus 8 is connected to each relay terminal 26. ing. When the internal buses 8 are arranged on the relay terminal board 27, the internal buses 8 of the first and second circuit switch gears are sequentially arranged from the left side to the right side of the relay terminal board 27 from the first circuit switch gear. Place. When arranging, the internal bus 8 of each circuit switchgear is arranged while wrapping the one-phase 1X, 2X, 3X on one side while wrapping the two-phase and three-phase 2X-2Z, 3X-3Z on the other side. In addition, measures such as prevention of thermal deterioration and the like are provided by simplifying the wiring and preventing the wiring errors and distributing the internal buses.

First to third circuit switch gears 1 to 3
Are arranged in a vacuum grounded container grounded E and have the following configuration. However, since the phase switch gears 2X to 2Z have the same configuration, only the configuration of the phase switch gear 2X for one phase will be described. The description of the other-phase switch gears 2Y and 2Z is omitted. Inside the vacuum grounding container 4, a movable electrode 7 that rotates between a grounding device 6 and a fixed electrode 5 arranged corresponding to the grounding device 6 is arranged, and a cable head 10 is arranged corresponding to the movable electrode 7. These are arranged in a cross shape as a whole. A grounding device 6, a movable blade 30, and a load-side conductor 9 that extend through three through holes (not shown) formed in the vacuum grounding container 4 extend outside the vacuum container.

The grounding device 6 has a grounding-side bottom fitting 31 at one end, a grounding-side bushing 32 made of a ceramic material having an open end at the other end, and a flange 33 provided around the outer periphery of the grounding-side bushing 32. The ground-side sealing fitting 34 attached to 33 is welded to the vacuum grounding container 4. A grounding bellows 35, a spring 36, and a grounding conductor 37 are arranged in the grounding bushing. The ground-side conductor 37 extends to the outside through the ground-side bottom fitting 31, and the end of the ground-side conductor 37 is connected to the above-mentioned common ground conductor 24 by a screw. The ground conductor 38 is made of a flexible conductor, and can be electrically connected even when the ground-side conductor 37 moves. A ground electrode 39 is fixed to the ground conductor 37 on the opposite side. The ground conductor 38 is formed of a flexible conductor, and is electrically connected even when the ground conductor 37 moves. When the ground electrode 39 is pushed toward the ground-side bottom metal fitting, the spring 36 contracts together with the ground-side bellows 35. At this time, the spring 36 always presses the ground electrode 39 toward the movable electrode due to the contracted force. The fixed electrode 5 corresponding to the grounding device 6 is connected to the internal bus 8 of three phases. 3
The internal buses 8 of the phases are arranged as shown in FIG.
The fixed electrode 5 is supported by a fixed insulating cylinder 42 made of a ceramic material via a fixed relay fitting 41. Fixed insulating tube 4
A fixed support 43 supporting the other end of the second 2 is fixed to the vacuum grounded container by a brazing material. That is, the fixed insulating cylinder 4
A fixed relay fitting 41 and a fixed support fitting 43 are previously attached to both ends of 2.

The movable electrode 7 is disposed between the grounding device 6 and the fixed electrode 5, and the movable electrode 7 is supported by a movable insulating cylinder 45 made of a ceramic material via a movable relay fitting 44. One end is supported by the movable support bracket 46 as described above, and the movable support bracket 46 is supported by the movable blade 30. The movable blade 30 extends outside through the movable support plate 47. The movable support plate 47 is a
It is fixed to. The movable blade 30 is surrounded by an extendable movable bellows 48, one end of the movable bellows 48 is attached to a movable support bracket 46, and the other end is attached to a movable support plate 47, and the movable blade 30 rotates left and right and up and down. To be able to The movable blade 30 has a main shaft 4
It rotates in the direction of the arrow with 9 as a fulcrum, and comes into contact with and separates from the grounding device 6 and the fixed electrode 5. The electrodes 5 to 7 are mainly composed of Cr-W-Pb alloy, Cu-Ni alloy, Cu-Cr
A high melting point metal member such as an alloy or a Cu-Ag alloy is used.

The movable blade 30 rotates about the main shaft 49 as a fulcrum by driving an operating mechanism (not shown) connected to the tip of the movable blade 30. The operation shaft 50 connects the movable blade 30 and the operation mechanism. Note that a structure in which only the movable electrode is provided at the tip of the movable blade 30 may be used. In this case, any one of the movable blade and the operation mechanism needs an insulating means for interrupting the current.

The tip of the movable electrode 7 and the load-side conductor 9 are connected by a flexible conductor 22. Load side conductor 9
Are connected to the cable head 10 through a load side bushing 21A made of a ceramic material. A load-side sealing member 53 is provided at the end of the load-side bushing 21A, and the load-side sealing member 53 is welded to a brazing material around an opening provided in the vacuum grounding container 4 to be supported. The ground surface metal layer 54 is provided on the ceramic surface of the load side bushing 21A which is exposed to the outside, so that leakage current flows to the ground E via the vacuum grounding container 4, and there is a danger even if an operator comes into contact with the cable head 10. Safety measures are taken to prevent this from happening.

Next, the operation of the phase switch gear will be described with reference to FIGS. The movable electrode 7 is disposed between the grounding device 6 and the fixed electrode 5 as shown in FIG.
And the disconnection position Y3. From this position, the movable electrode 7 is rotated in the arrow direction X1 as shown in FIG. 6, and the movable electrode 7 is in a so-called ground position Y4 where the movable electrode 7 contacts the ground electrode 39, and the ground electrode 39 is always movable. It is pressed by a spring 36 in the electrode direction.
The movable electrode 7 is moved from the ground position Y4 in the arrow direction X as shown in FIG.
2, the movable electrode 7 is in contact with the fixed electrode 5 and is also connected to the load-side conductor 9, which is a so-called closing position Y1.

At the input position Y1, the movable electrode 7 is
And is connected to the load-side conductor 9.
In this case, unlike the related art, power is supplied from the movable electrode 7 to the load-side conductor 9 via the fixed electrode 5 and the flexible conductor 22 without passing through the movable blade 30. Compared with this, the power consumption can be greatly reduced, the electric resistance is reduced, and the power loss and the generated heat can be reduced accordingly.

On the other hand, the power is always supplied to the load at the so-called input position Y1, the operation time is longer than the use time at other positions, and if the flexible conductor 22 is not used, the movable electrode 7 is directly loaded. Sliding on the side conductor 9 is conceivable. This means that the movable electrode 7 slides directly on the load-side conductor 9 and current continues to flow while the movable electrode 7 and the load-side conductor 9 are in contact with each other. May be welded. As a result, if the rotating force of the operation mechanism is increased to separate the welded movable electrode 7 and the load-side conductor 9, the operation can be minimized, but it is possible to avoid an increase in the size of the operation mechanism. Instead, the switchgear becomes large and costly.

Further, sliding during the generated heat causes severe wear, and the life of both electrodes is short. Further, when the movable electrode 7 slides on the load-side conductor 9, fine metal particles generated from the movable electrode 7 and the load-side conductor 9 diffuse and remain in the vacuum grounded container, so that dielectric breakdown is easily caused.

On the other hand, in the present invention, the movable electrode 7 and the movable electrode 7 are connected between the load-side conductor 9 and the movable electrode 7 by a flexible conductor 22 that does not slide directly on the load-side conductor 9. The welding of the side conductor 9 does not occur, the rotating force of the operating mechanism is not increased as described above, and the operating mechanism can be downsized, and the life of the movable electrode 7 and the load-side conductor 9 is also longer than the above. It is longer and economically advantageous. The flexible conductor 22 connects between the load-side conductor 9 and the movable electrode 7, and does not generate metal vapor when the movable electrode 7 slides on the load-side conductor 9 as described above. It is clear that the cutoff characteristics are greatly improved as compared to the above, and the vacuum grounding container 4 can be downsized accordingly.

Further, since the present invention can be used even if the grounding device and the disconnecting position are removed, the vacuum grounding container and the operating mechanism can be further reduced in size, so that the switch gear for one circuit can of course be reduced in size.

The movable electrode 7 disposed between the grounding device 6 and the fixed electrode 5 is connected to the load-side conductor 9 and the movable blade 30.
Are arranged on a straight line, the movable electrode 7 and the load-side conductor 9
The flexible conductor 22 connecting between the movable electrode 7
And the load side conductor 9 and the cable head 10 can be connected in the shortest distance, so that the electric resistance is reduced, and the heat generated in the vacuum grounding vessel can be reduced accordingly. Further, since the flexible conductor 22 is used, the movable electrode 7 can be rotated left and right while being electrically connected to the load-side conductor 9. Further, since the flexible conductor 22 has a curved shape, it has a function of absorbing expansion and contraction of the movable electrode 7 and the load-side conductor 9 and a function of reducing electric field concentration.

On the other hand, the movable electrode 7 is parallel to the movable blade 30 at the cut-off position Y2, and the fixed electrode 5 and the grounding device 6 are inclined to the fulcrum side in accordance with the inclined surface of the movable electrode 7 inclined at the closing position Y1. To place. The inclination direction is formed such that the gap between the movable electrode 7 and the fixed electrode 5 and the grounding device 6 is gradually increased from one end of the movable electrode 7 on the movable blade 30 side to the other end.

For this reason, the gap between the fixed electrode 5 and the grounding device 6 can be reduced by an amount corresponding to the inclination of the fixed electrode 5 and the grounding device 6, so that the gap can be reduced by an amount corresponding to the inclination when the vacuum grounding container is not inclined. Became. This means that, of course, if only the fixed electrode side is inclined, the switchgear can be downsized by a circuit equivalent to half the gap described above. More specifically, the movable electrode 7 and the main shaft 49 are positioned at a position where the movable electrode 7 is disconnected from the fixed electrode 5 in FIG.
, A vertical line Y is drawn at the center point 0 of the movable electrode 7.
Most of the contact surface corresponding to the movable electrode 7 is arranged on the main shaft 49 side except that the fixed electrode 5 and a part of the grounding device 6 are in contact with the horizontal axis X. To the other end on the X-axis side to form an inclined surface having a wider gap with the movable electrode 7. Therefore, the above-described effects can be achieved. Needless to say, this can be applied to the arrangement of the fixed electrode 5 and the movable electrode 7.

In addition to the above, the circuit switchgear of the present invention may be a circuit breaker in which the movable electrode opens and closes with the fixed electrode, a switch such as a vacuum circuit breaker, a disconnector in which the fixed electrode and the movable electrode come and go, a ground switch. It can also be used as a stand-alone product such as a switch. In addition to the above, the present invention can also be applied to an insulating switch using an insulating medium, for example, SF ₆ gas. Further, the present invention can be applied to a switch of a type in which a movable electrode comes into contact with or separates from a fixed electrode with a main shaft as a fulcrum, and a current flows from the movable electrode to a load or a power supply.

[0041]

As described above, according to the switchgear of the present invention, electric power is supplied from the movable electrode to the load-side conductor via the fixed electrode and the flexible conductor. As a result, the electric resistance can be reduced, and the power loss and the generated heat can be reduced accordingly. Also, the movable electrode is connected to the movable electrode with a flexible conductor that does not slide directly on the load-side conductor, so that no welding occurs on the load-side conductor and the movable electrode. Not only can the gears be reduced in size, but also the current interrupting characteristics are improved, so that the vacuum grounding container can be further downsized and used as a switchgear for one circuit without the grounding device. Since the vacuum vessel and the operating mechanism can be reduced in size by removing the grounding device, it goes without saying that the switchgear for one circuit can be reduced in size.

Further, since the distance between the fixed electrode and the grounding device can be reduced by an amount corresponding to the inclination of the fixed electrode and the grounding device, the size of the vacuum grounding container can be reduced. This means that the interval can be reduced only by the inclination of the fixed electrode, so that the switch gear can be reduced in size by the circuit.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a collective switchgear according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a configuration of a circuit switchgear used in FIG.

FIG. 3 is a side sectional view showing a configuration of a circuit switchgear used in FIG. 1;

FIG. 4 is a front view of FIG. 3 as viewed from the left side.

FIG. 5 is a plan view of the bus connection terminal block shown in FIGS. 1 to 4;

FIG. 6 is a side sectional view showing a configuration of a switchgear for a circuit shown in FIG. 3 in a cutoff / disconnected state;

FIG. 7 is a side sectional view showing a grounded state of the switchgear for the circuit of FIG. 6;

8 is a side sectional view showing a closed state of the switchgear for the circuit of FIG. 6;

[Explanation of symbols]

1-3: circuit switch gears, 2X-2Y: phase switch gears, 4: vacuum ground container, 5: fixed electrode, 6: grounding device,
7 movable electrode, 8 internal bus, 9 load-side conductor, 11
Power supply side cable, 22: flexible conductor, 30: movable blade.

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Ayumu Morita 7-2-1, Omika-cho, Hitachi City, Ibaraki Pref.

Claims (10)

[Claims] A grounding device, a load-side conductor and a fixed electrode disposed in a vacuum grounding container, and a movable electrode that comes into contact with and separates from the fixed electrode and the grounding device via a fulcrum of a main shaft. A switchgear, wherein the device and the switchgear are arranged to be inclined toward a fulcrum. 2. The switchgear according to claim 1, wherein the movable electrode has a disconnection position while moving from a closing position of the fixed electrode to a grounding position. 3. A fixed electrode disposed in a vacuum grounded container,
A switchgear, comprising: a movable electrode that comes in contact with and separates from a fixed electrode via a fulcrum of a main shaft, wherein the fixed electrode is arranged to be inclined toward the fulcrum. 4. The tilting direction is such that the distance between the movable electrode and at least one of the two electrodes is gradually increased from one end to the other end of the movable side driving portion of the movable electrode. The switchgear according to claim 1. 5. The movable electrode is in parallel with the movable side drive unit at the shut-off position, and at least one side of the fixed electrode and the grounding device is arranged to be inclined in accordance with the inclined surface of the movable electrode which is inclined at the closing position. The switchgear according to claim 1, wherein the switchgear is provided. 6. The switchgear according to claim 1, wherein a load-side conductor disposed in the vacuum grounding vessel and the movable electrode are connected by an electric means. 7. The switchgear according to claim 1, further comprising means for interrupting a current flow at a part of the movable electrode and the movable-side drive unit. 8. The switchgear according to claim 1, wherein a refractory metal member is used for said electrode. 9. A fixed electrode disposed in a vacuum grounded container,
A movable electrode that comes into contact with and separates from the fixed electrode via a fulcrum of the main shaft, and one or more of a circuit breaker, a disconnector, a load switch, and a grounding device in which the fixed electrode is inclined toward the fulcrum. A switchgear characterized by being used for a group of switchgears. 10. The switchgear according to claim 1, wherein a grounded container having an insulating medium is used in place of the vacuum grounded container.